[simoncion]

> Moreover, all the motherboards with ECC support must have in the "Advanced" BIOS Setup an option for enabling ECC, which must be used, because the default is always to disable ECC.

On both of my Ryzen ASUS motherboards (WS X570-ACE, and ROG STRIX X399-E GAMING) this is not true. I just slapped the DIMMs in there and powered the box up.

dmidecode thinks that the system has ECC enabled:

  dmidecode --type memory | grep -e "Error Correction"
   Error Correction Type: Multi-bit ECC

'amd64_edac' doesn't complain about being loaded on a non-ECC system.

The closed-source version of memtest86 reports that it's running on an ECC-enabled system.

[adrian_b]

This may depend on the BIOS version, even on the same motherboard.

I also have the same ASUS Pro WS X570-ACE (bought in Q4 2019), which I use with ECC DIMMs, and I had to enable in BIOS the support for ECC.

In any case, one should always check for such an option in the BIOS, to avoid surprises.